Headings are necessary to help users scan your content more efficiently. Typically, the more prominent the information the larger and bolder the headings font size. Try to begin your headings with keywords.
Be sure to use true headings, don't just increased the font size and make your text bold. Text editors have features built-in to semantically mark the difference between paragraph and various heading level text. Using true headings will make your document more clear to read, appear organized, and optimize search capabilities for all your users, including those who may use assistive technologies to scan pages.
To organize your document, use heading 1 as the title of your document or the broadest topic. In most cases, a document has only one heading 1, though some exceptions do exist.
The rest of your document should be divided into subheadings and minor-headings. Heading 2 styles are subheadings nested under your heading 1. These subheadings contain a point connected to the broadest topic.
Continuing in the nesting order, heading 3 is a minor-heading placed under the heading 2 subheading. Each subsequent minor-heading is then nested under its previous heading. Avoid skipping headings levels.